<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar-box">
        <img src="../assets/logo.jpg" alt="">
      </div>
      <!--登录表单区域-->
      <el-form :model="loginForm" :rules="loginFormRules" ref="loginFormRef" class="login_form" size="mini">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"
          type="password"></el-input>
        </el-form-item>
        <!--按钮区域 登录和重置-->
        <el-form-item class="btns">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: "Login",
  data() {
    return {
      //登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //登录表单的验证规则
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        //验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //点击重置按钮，重置登录表单
    resetLoginForm() {
      this.$refs['loginFormRef'].resetFields();
    },
    login() {
      //valid中保存了表单预验证的结果
      this.$refs['loginFormRef'].validate(async valid => {
        if(!valid) return; //表示没有通过预验证，直接return，不发起网络请求
        const {data : res} = await this.$http.post('login',this.loginForm);//{data:res}解构得到data重命名为res
        if(res.meta.status !== 200){ //当状态码为200时代表登录成功，否则为登录失败
          return this.$message.error('登录失败');
        }
        this.$message.success('登录成功');
        console.log(res);
        window.sessionStorage.setItem('token',res.data.token);
        this.$router.push('/home');
      });
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%; // 使背景色撑满全屏
}
.login_box {
  width: 300px;
  height: 200px;
  background-color: #fff;
  border-radius: 3px; //圆角边框
  //将盒子放到页面的正中间
  position: absolute;
  left: 50%;
  top: 50%;
  transform:translate(-50%,-50%);
  .avatar-box {
    width: 75px;
    height: 75px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 5px;
    box-shadow: 0 0 5px #eee;
    position: absolute;
    left: 50%;
    //transform: translate(-50%,-50%);反向移动自身的50%
    transform: translate(-50%,-50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
    }
  }
  .login_form {
    width: 100%;
    position: absolute;
    bottom: 0;
    padding: 0 5px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
}
</style>
